package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

import java.util.prefs.AbstractPreferences;

public class LoginActivity extends AppCompatActivity {
    private TextView tv_main_title;
    private TextView tv_back, tv_register, tv_find_psw;
    private Button btn_login;
    private String userName, psw, spPsw;
    private EditText et_user_name, et_psw;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        init();
    }

    private void init() {
        tv_main_title = (TextView) findViewById(R.id.title_text);
        tv_main_title.setText("登录");
        tv_back = (TextView) findViewById(R.id.title_back);
        tv_register = (TextView) findViewById(R.id.textView);
        tv_find_psw = (TextView) findViewById(R.id.textView2);
        btn_login = (Button) findViewById(R.id.button);
        et_user_name = (EditText) findViewById(R.id.edit_user);
        et_psw = (EditText) findViewById(R.id.edit_pw);

        tv_back.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                LoginActivity.this.finish();
            }
        });

        tv_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivityForResult(intent, 1);
            }
        });

        tv_find_psw.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        btn_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                userName = et_user_name.getText().toString().trim();
                psw = et_psw.getText().toString().trim();
                String md5Psw = MD5Utils.md5(psw);
                spPsw = readPsw(userName);
                if (TextUtils.isEmpty(userName)) {
                    Toast.makeText(LoginActivity.this, "请输入用户名",
                            Toast.LENGTH_SHORT).show();
                    return;
                } else if (TextUtils.isEmpty(psw)) {
                    Toast.makeText(LoginActivity.this, "请输入密码",
                            Toast.LENGTH_SHORT).show();
                    return;
                } else if (md5Psw.equals(spPsw)) {
                    Toast.makeText(LoginActivity.this, "登录成功",
                            Toast.LENGTH_SHORT).show();
                    saveLoginStatus(true,userName);
                    Intent data = new Intent();
                    data.putExtra("isLogin", true);
                    setResult(RESULT_OK, data);
                    LoginActivity.this.finish();
                    return;
                } else if ((!TextUtils.isEmpty(spPsw) && !md5Psw.equals(spPsw))) {
                    Toast.makeText(LoginActivity.this, "输入的用户名和密码不一致",
                            Toast.LENGTH_SHORT).show();
                    return;
                } else {
                    Toast.makeText(LoginActivity.this, "此用户名不存在",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });
    }


    private String readPsw(String userName) {
        SharedPreferences sp=getSharedPreferences("loginInfo",MODE_PRIVATE);
        return sp.getString(userName,"");
    }

    private void saveLoginStatus(boolean status, String userName) {
        SharedPreferences sp=getSharedPreferences("loginInfo",MODE_PRIVATE);
        SharedPreferences.Editor editor=sp.edit();
        editor.putBoolean("isLogin",status);
        editor.putString("loginUserName",userName);
        editor.commit();
    }
    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data){
        super.onActivityResult(requestCode,resultCode,data);
        if (data!=null){
            String userName=data.getStringExtra("userName");
            if (!TextUtils.isEmpty(userName)){
                et_user_name.setText(userName);
                et_user_name.setSelection(userName.length());
            }
        }
    }
}


